Yes, yes it is. Its been known to slow down systems with more power then yours. Remove it an get a free anti virus like AVG Free or Avast! though I would personally recommend Avast as it uses far less RAM, better update schedule and the interface is kinda cute as well =]
Well im waiting until my subscription is up. Like in a month and a half. Im thinking about getting kaspersky antivirus. Hopefully this will fix this.